fio: (g=0): rw=randrw, bs=4K-256K/4K-256K, ioengine=posixaio, iodepth=8
...
fio: (g=0): rw=randrw, bs=4K-256K/4K-256K, ioengine=posixaio, iodepth=8
Starting 3 threads
Threads: 3
Threads: 3
Threads: 3: [mFm] [5.1% done] [  2932/   577 kb/s] [eta 00m:56s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=31257, got signal=6
Threads: 2: [m_m] [10.3% done] [ 10570/ 34011 kb/s] [eta 00m:35s]
Threads: 2: [F_m] [14.3% done] [  6674/ 29615 kb/s] [eta 00m:30s]
Threads: 2: [F_m] [14.6% done] [   858/     0 kb/s] [eta 00m:35s]
Threads: 2: [F_m] [15.9% done] [  1527/   162 kb/s] [eta 00m:37s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
Threads: 2: [V_m] [40.0% done] [  6918/ 29774 kb/s] [eta 00m:12s]
fio: pid=31256, got signal=6
Threads: 1: [__m] [64.3% done] [  9602/ 24962 kb/s] [eta 00m:05s]
fio: ioengines.c:195: td_io_queue: Assertion `(io_u->flags & IO_U_F_FLIGHT) == 0' failed.
fio: pid=31258, got signal=6

fio: (groupid=0): err= 0: pid=31256
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=32.8%, 2=54.0%, 4=7.2%, 8=6.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=87.1%, 4=3.8%, 10=1.6%, 20=0.2%, 50=0.5%, 100=1.1%
     lat (msec): 250=4.3%, 500=0.4%, 750=0.1%, 1000=0.2%, >=2000=0.4%
fio: (groupid=0): err= 0: pid=31257
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.2%, 2=81.9%, 4=17.9%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=93.4%, 4=6.2%, 10=0.0%, 20=0.0%, 50=0.0%, 100=0.0%
     lat (msec): 250=0.0%, 500=0.0%, 750=0.0%, 1000=0.0%, >=2000=0.0%
fio: (groupid=0): err= 0: pid=31258
  cpu          : usr=0.00%, sys=0.00%, ctx=0
  IO depths    : 1=0.3%, 2=53.5%, 4=21.5%, 8=24.6%, 16=0.0%, 32=0.0%, >=64=0.0%
     lat (msec): 2=59.4%, 4=3.1%, 10=1.8%, 20=5.8%, 50=13.5%, 100=5.8%
     lat (msec): 250=7.2%, 500=1.1%, 750=0.6%, 1000=0.4%, >=2000=0.9%

Run status group 0 (all jobs):

Disk stats (read/write):
  cciss!c0d0: ios=1164/1720, merge=24/47541, ticks=24592/563652, in_queue=588236, util=91.15%
2.19user 2.65system 0:10.15elapsed 47%CPU (0avgtext+0avgdata 0maxresident)k
131320inputs+514464outputs (0major+2461minor)pagefaults 0swaps